Air conditioner



FIG. 1 is a perspective view of an air conditioner according to my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof; and,

FIG. 6 is a front view thereof.

The broken lines shown in the figures show environmental subject matter that forms no part of the claimed design. 

CLAIM The ornamental design for an air conditioner, as shown and described. 